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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A371770 a(n) = Sum_{k=0..floor(n/3)} binomial(3*n-3*k-1,n-3*k).

Table of values

n a(n)
0 1
1 2
2 10
3 57
4 338
5 2057
6 12741
7 79914
8 505954
9 3226638
10 20696685
11 133382658
12 862978221
13 5601919325
14 36467212610
15 237974911737
16 1556281907586
17 10196788555859
18 66921360130374
19 439860632463462
20 2895002186799453
21 19077000179746293
22 125849150650146714

List of values

[1, 2, 10, 57, 338, 2057, 12741, 79914, 505954, 3226638, 20696685, 133382658, 862978221, 5601919325, 36467212610, 237974911737, 1556281907586, 10196788555859, 66921360130374, 439860632463462, 2895002186799453, 19077000179746293, 125849150650146714]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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